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Continuous black exhaust from the stack when under a constant load is also an indication that some of the fuel is not being burned. [5] Additionally, wet stacking can result in a build up of diesel fuel in the engine which does not combust due to the low temperature in the engine. This results in a reduced fuel economy.
By replacing some of the fresh air intake with inert gases EGR also allows the engine to reduce the amount of injected fuel without compromising ideal air-fuel mixture ratio, therefore reducing fuel consumption in low engine load situation (for ex. while the vehicle is coasting or cruising).
Its composition may vary with the fuel type, rate of consumption or speed of engine operation (e.g., idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive, marine vessel, or stationary generator or other application. [1]
Another method of fuel staged combustion is fuel biasing. In fuel biasing, combustion is staged by diverting fuel from the upper-level burners to the lower ones or from the center to the side burners. The aim is to create a fuel-rich lower or central zone and a fuel-lean upper or side zone in order to achieve complete burnout.
The EPA calculated that new trucks would save operators a total of $3.5 billion in fuel and other costs from 2027 to 2032, paying for themselves in two to four years.
2008 Monroney sticker highlights fuel economy. EPA tests for fuel economy do not include electrical load tests beyond climate control, which may account for some of the discrepancy between EPA and real world fuel-efficiency. A 200 W electrical load can produce a 0.94 mpg (0.4 km/L) reduction in efficiency on the FTP 75 cycle test. [14]
Military drivers will now get specialised training in preparation for their possible deployment, ministers announced.
This is done to increase fuel efficiency while under varying loads. Variable compression engines allow the volume above the piston at top dead centre to be changed. Higher loads require lower ratios to increase power, while lower loads need higher ratios to increase efficiency, i.e. to lower fuel consumption.